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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Feb 16, 2021

Informix documentation for oncheck command should be crystal clear

Informix documentation for oncheck command does not explain clearly that this command should be run only during a maintenance window or during an off-hours period because the oncheck utility places a shared lock on system catalog tables when the database is checked and that the shared lock prevents any other updates, inserts, or deletes on the database until the check has completed. Various aspects of this information are found on a variety of sources of IBM documentation, but the information is not expressed clearly on the page that is intended to describe this command. I had to ask Informix Support multiple questions before I could get the answer I needed. Previously I had the oncheck command running on our production machine on Sundays, but even then it would sometimes cause problems for other production applications that were running on that day.

Needed by Date Feb 16, 2021
  • Guest
    Oct 18, 2021

    Would it be possible to elaborate a little more what locks had been observed, with what oncheck commands, and how they prevented any other updates, inserts, or deletes on the database until the check has completed?